class_docstr: Receive elements from target process.
class_docstr_tok: ["Receive","elements","from","target","process","."]
code: def backward(self, inputs, grad_outputs):
      xp = backend.get_array_module(*inputs)
      self.comm.send(grad_outputs, self.peer_rank, self.peer_tag)
  
      # dummy_var is needed to maintain Chainer's constraint.
      if inputs == ():
          dummy_var = tuple([xp.array([], dtype=xp.float32)])
      else:
          dummy_var = tuple([xp.zeros_like(x) for x in inputs])
  
      return dummy_var
  
file_path: chainer/chainermn/functions/point_to_point_communication.py
imports: import chainer
  from chainer import backend
  import chainer.utils
label_desc: Use image node_id 5 for calling the Recv obj's underlying member method code with example usage: obj.backward(inputs, grad_outputs) and returns: dummy_var